1. Polyamides are formed by a condensation reaction between:

a) Two alkenes
b) A dicarboxylic acid and a diamine
c) Two alcohols
d) Two carboxylic acids

2. What type of bond links the monomers in a polyamide?

a) Ester bond
b) Amide bond
c) Ionic bond
d) Double bond

3. What small molecule is eliminated when a polyamide forms?

a) Hydrogen gas
b) Carbon dioxide
c) Water or hydrogen chloride
d) Oxygen

4. Nylon-6,6 is made from monomers each containing:

a) 4 carbon atoms
b) 5 carbon atoms
c) 6 carbon atoms
d) 12 carbon atoms

5. Which pair of monomers is used to make nylon-6,6?

a) Ethane-1,2-diol and hexanedioic acid
b) Hexane-1,6-diamine and hexanedioic acid
c) Glycine and alanine
d) Propene and ethene

6. In the “nylon rope trick,” the diamine reacts with:

a) Another diamine
b) An acid chloride
c) A diol
d) An alkene

7. Why are nylon fibres strong?

a) They contain metallic bonding
b) The polymer chains are branched and loosely packed
c) Long chains align and form strong intermolecular bonds
d) They contain ionic cross-links

8. Which statement about condensation polymerisation is correct?

a) Only one product forms
b) The monomers must contain C=C bonds
c) A small molecule such as water is released
d) It involves addition across double bonds

9. Amino acids can form polyamides because:

a) They contain both –NH₂ and –COOH groups
b) They contain a C=C bond
c) They are hydrocarbons
d) They contain alcohol and aldehyde groups

10. Nylon is classed as a thermoplastic because:

a) It cannot be melted
b) It decomposes on heating
c) It softens and melts when heated and can be remoulded
d) It conducts electricity when molten